arXiv 2406.069932024-06-11hep-phhep-ex

分子型六夸克谱

Spectrum of the molecular hexaquarks

Bo Wang, Kan Chen, Lu Meng, Shi-Lin Zhu

备注：: 17 pages, 13 tables
发表信息：: Phys. Rev. D. 110, 014038 (2024)
DOI：: 10.1103/PhysRevD.110.014038

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AI总结：

本研究基于有效夸克相互作用，探讨了由粲重子等组成的分子型六夸克态质量谱，发现四夸克与五夸克分子态的存在预示了重味扇区中大量类氘六夸克的出现。

摘要：

我们研究了双重子系统中分子型六夸克态的质量谱。这些系统由粲重子$[Σ_c^{(\ast)}$、$Ξ_c^{(\prime,\ast)}]$、双粲重子$[Ξ_{cc}^{(\ast)}]$和超子$[Σ^{(\ast)}$、$Ξ^{(\ast)}]$组成。我们考虑了粒子-粒子和粒子-反粒子对的所有可能组合，包括每种组合中的S波自旋多重态。我们利用有效夸克层次相互作用，建立了分子型四夸克、五夸克和六夸克之间的底层联系。我们发现，$DD^\ast$、$D\bar{D}^\ast$和$Σ_c\bar{D}^{(\ast)}$系统中分子态的存在，导致了重味扇区中大量类氘六夸克的出现。目前已有若干分子型四夸克和五夸克的实验候选者。对近阈值六夸克的实验探索将进一步推进强子分子底层动力学图景的建立，并加深我们对自旋-味对称性在近阈值剩余强相互作用中作用的理解。

英文摘要：

We investigate the mass spectra of molecular-type hexaquark states in the dibaryon systems. These systems are composed of the charmed baryons $[Σ_c^{(\ast)}$, $Ξ_c^{(\prime,\ast)}]$, doubly charmed baryons $[Ξ_{cc}^{(\ast)}]$, and hyperons $[Σ^{(\ast)}$, $Ξ^{(\ast)}]$. We consider all possible combinations of particle-particle and particle-antiparticle pairs, including the S-wave spin multiplets in each combination. We establish the underlying connections among the molecular tetraquarks, pentaquarks, and hexaquarks with the effective quark-level interactions. We find that the existence of molecular states in $DD^\ast$, $D\bar{D}^\ast$, and $Σ_c\bar{D}^{(\ast)}$ systems leads to the emergence of a large number of deuteron-like hexaquarks in the heavy flavor sectors. Currently, there have been several experimental candidates for molecular tetraquarks and pentaquarks. The experimental search for near-threshold hexaquarks will further advance the establishment of the underlying dynamical picture of hadronic molecules and deepen our understanding of the role of spin-flavor symmetry in near-threshold residual strong interactions.

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